Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2025-08-03 17:16:04 +00:00
Code Issues Projects Releases Packages Wiki Activity

[NTOSKRNL]

Browse source 
Make MmIsAddressValid portable by using _MI_PAGING_LEVELS macro.

svn path=/trunk/; revision=48238
This commit is contained in:
Timo Kreuzer 2010-07-25 00:50:03 +00:00
parent a28e798006
commit 0bbdcf4d8b
4 changed files with 27 additions and 27 deletions
Download patch file Download diff file Expand all files Collapse all files

2
reactos/ntoskrnl/include/internal/amd64/mm.h
View file

@ -4,6 +4,8 @@
#pragma once
#define _MI_PAGING_LEVELS 4
/* Helper macros */
#define PAGE_MASK(x) ((x)&(~0xfff))
#define PAE_PAGE_MASK(x) ((x)&(~0xfffLL))

6
reactos/ntoskrnl/include/internal/i386/mm.h
View file

@ -7,6 +7,12 @@
struct _EPROCESS;
PULONG MmGetPageDirectory(VOID);
#ifdef _PAE_
#define _MI_PAGING_LEVELS 3
#else
#define _MI_PAGING_LEVELS 2
#endif
#define PAGE_MASK(x) ((x)&(~0xfff))
#define PAE_PAGE_MASK(x) ((x)&(~0xfffLL))

34
reactos/ntoskrnl/mm/ARM3/mmsup.c
View file

@ -64,22 +64,26 @@ BOOLEAN
NTAPI
MmIsAddressValid(IN PVOID VirtualAddress)
{
//
// Just check the Valid bit in the Address' PDE and PTE
//
if ((MiAddressToPde(VirtualAddress)->u.Hard.Valid == 0) ||
(MiAddressToPte(VirtualAddress)->u.Hard.Valid == 0))
{
//
// Attempting to access this page is guranteed to result in a page fault
//
return FALSE;
}
#if _MI_PAGING_LEVELS >= 4
/* Check if the PXE is valid */
if (MiAddressToPxe(VirtualAddress)->u.Hard.Valid == 0) return FALSE;
#endif
//
// This address is valid now, but it will only stay so if the caller holds
// the PFN lock
//
#if _MI_PAGING_LEVELS >= 3
/* Check if the PPE is valid */
if (MiAddressToPpe(VirtualAddress)->u.Hard.Valid == 0) return FALSE;
#endif
#if _MI_PAGING_LEVELS >= 2
/* Check if the PDE is valid */
if (MiAddressToPde(VirtualAddress)->u.Hard.Valid == 0) return FALSE;
#endif
/* Check if the PTE is valid */
if (MiAddressToPte(VirtualAddress)->u.Hard.Valid == 0) return FALSE;
/* This address is valid now, but it will only stay so if the caller holds
* the PFN lock */
return TRUE;
}

12
reactos/ntoskrnl/mm/amd64/page.c
View file

@ -519,16 +519,4 @@ MmCreateProcessAddressSpace(IN ULONG MinWs,
return 0;
}
BOOLEAN
NTAPI
_MmIsAddressValid(IN PVOID VirtualAddress)
{
/* Check all four page table levels */
return (MiAddressToPxe(VirtualAddress)->u.Hard.Valid != 0 &&
MiAddressToPpe(VirtualAddress)->u.Hard.Valid != 0 &&
MiAddressToPde(VirtualAddress)->u.Hard.Valid != 0 &&
MiAddressToPte(VirtualAddress)->u.Hard.Valid != 0);
}
/* EOF */